Question

Find the first term, if second, third and fourth terms are 21, 80, 120.

Answer 1

Answer:

A2 =21

A3=80

A4=120

put two values÷÷

by eleminating mathod÷

a+d=21

a+2d=80

__________

-d=-79

minus is cancelled to minus d= 79

put in any one equation

a+79=21

a=21-79

a=-58

A2 =-58+79

=21

so first term of ap is -58

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first \: term \: - 58firstterm−58

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