Question

The first term of an A.P. is 5 and common difference is 10. Find the sum of first 10 terms of the A.P.​

Answer 1

Answer:

.: Sum of first 10 terms of an given A.P. is an 500.

Step-by-step explanation:

In an A.P. sequence,

first term (a) = 5

common difference (d) = 10

sum of first 10 terms (S10) = ?

:. n = 10

Answer 2

Answer:

a=5, d=10

sum of ten terms = 10/2{2a+(10-1)d}

=5{2×5+(9)10}

= 5{10+90}

=5{100}

500

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