Question

find the sum of first 15 term of an A.P 2,7,12.....
​

Answer 1

Answer:

ANSWER

2,7,12,... to 10 terms

Here a=2,d=7−2=5

S

10

=

2

10

[2×2+9×5]

=5(4+45)

=5×49

S

10

=245

[S

n

=

2

n

[2a+(n−1)d] a= first term; d= common difference)

Step-by-step explanation:

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Answer 2

Answer:

Answer is 555.

Step-by-step explanation:

answer 555