for the AP : (-3),(-7),(-11),.. can we find directly a30-a20 without finding a30 and a20?give reasons.
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because,N=-7-(-3)=-4
a1+(-4×30) to a1+(-4×20)=a30 to a20
we find directly a30-a20 is a1+(-4×*(*=any natural nember between 20 to 30))without finding a30 and a20.
a1+(-4×30) to a1+(-4×20)=a30 to a20
we find directly a30-a20 is a1+(-4×*(*=any natural nember between 20 to 30))without finding a30 and a20.
ganicutie:
can u define it clearly
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