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An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .?
Most Upvoted Answer
An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of ...
Solution :-
a = 5
d = 12 - 5 = 7
n = 50
an = a + (n - 1)d
an = 5 + (50 - 1)7
an = 5 + 49*7
an = 5 + 343
an = 348
Sum of the last 25 terms -
a = 348, d = - 7, n = 15
Sn = n/2[2a + (n - 1)d]
Sn = 15/2[2*348 + (15- 1) - 7]
Sn = 7.5[696 + (14 X - 7)]
Sn = 7.5[696 - 98]
Sn = 7.5*598
Sn = 4485
Sum of the last 15 term is 4485
Community Answer
An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of ...
A1=5,
d=12-5=7,
n=50,
a50=a+(n-1)d,
=5+(49)7=5+343=348,
a15=5+14(7)=5+98=103,
s15=15/2(5+103)
=15/2(108),
=15×54=810
d=12-5=7,
n=50,
a50=a+(n-1)d,
=5+(49)7=5+343=348,
a15=5+14(7)=5+98=103,
s15=15/2(5+103)
=15/2(108),
=15×54=810
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An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .?
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An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .?.
An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An AP 5,12,19.has 50 terms. Find its last term. Hence find the sum of last 15 terms .?.
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