Question

How many terms of the AP:2, 4,6,....are needed to make the sum 1122

Answer 1

Answer:

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Answer 2

Answer:

How many terms of the AP:2, 4,6,....are needed to make the sum 1122

Step-by-step explanation:

first term a=−6

Common Difference d=

2

1

Sum =−25

2

n

(2a+(n−1)d)=−25

2

n

(−12+(n−1)

2

1

)=−25

⟹n

2

−25n+100=0

⟹n=5,20