Question

Find the sum of all the natural numbers from 1to 15

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Answer 1

Answer:

FORMULA OF FINDING THE SUM OF NATURAL NUMBERS=n(n+1)/2

THE SUM OF 1-15 NUMBERS

S=n(n+1)/2

S=15(15+1)/2

S=(15×16)/2

S=15×8

S=120

so, the sum of first 15 natural numbers is

120 one hundred and twenty

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Answer 2

Answer:

A.P :- 1,2,3,4........15.

a = 1, d=1, n=15, & l =15.

Sum of first 15 Nos. = (15/2) (1+15)

= 7.5 × 16 = 120.

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