Question

in an AP the 5th term is 24 and 12th term is 94,then the sum of first 20 terms is ​

Answer 1

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HERE'S YOUR ANSWER ⤵⤵⤵⤵

⭕A5=24

⚫A+4D=24

⚫A=24-4D....(1)

⭕A12=94

⚫A+11D=94

↪ USING EQ1,WE GET....

↪24-4D+11D=94

↪7D=70

↪D=10(put this value in eq1)

⭕we get,

A=24-4(10)

A=24-40

A=-16

✔NOW USING THE FORMULA;

❌An=n/2[2A+(n-1)D]

↪A20=20/2[2(-16)+(20-1)*10]

↪A20=10[-32+19*10]

↪A20=10(-32+190)

↪A20=10*158

↪A20=1580 is the answer ❗ ❗

HOPE IT MAY HELPS UH ❤✌

Answer 2

Answer:

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