Question

10] In an Ap, a=3 S15 = 150 then d=?​

Answer 1

Step-by-step explanation:

ANSWER

S

n

=

2

n

(2a+(n−1)d)

S

15

=

2

15

(2×10+(15−1)13)

=

2

15

(20+182‬)

=

2

15

×202‬=1,515

∴S

15

=1,515

Answer 2

Answer:

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