In a A.P., a4=7, a7=4 a10=??
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A.P. T4=7. , T7=4. , T10=?
Tn=a+(n-1)d
T4=a+3d. .....(1)
T7=a+6d. ......(2)
by solving from substitution method
a=10. ,d=-1
T10= a+(n-1) d
= 10+(10-1)×-1
=10+9×-1
=10-9
=1
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