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Viva Voce: Arithmetic Progression II | Lab Manuals for Class 10 PDF Download

Q.1. Are all natural numbers whole numbers?

Yes


Q.2. Write down an AP having the sum of first 7 terms as zero.

-3, -2, -1, 0, 1, 2, 3.


Q.3. What is the formula for the sum of n terms of an AP?

Sn = (n/2)[2a + (n-1)d]


Q.4. If Sn = 3n2+2n, find the first term.

5


Q.5. What is the sum of first 10 natural numbers?

55


Q.6. Are all whole numbers natural numbers?

Except zero, all whole numbers are natural numbers.


Q.7. What does represent, where S„ represents the sum of n terms of an AP?

The nth term of an AP.


Q.8. What is the formula for the sum of n terms of an AP whose common difference is not given? [First term (a) and last term (i) known]

Sn=(n/2)[a+l], where l represents the last term.


Q.9. What is the arithmetic mean of 4 and 8?

6


Q.10. Find the common difference of an arithmetic progression of first 20 natural numbers.

1

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