Respuesta :
Answer:
126
Step-by-step explanation:
the formula for sum of arithmatic progression=n/2(2a+(n-1)d)
=9/2 (4+8*3)
=9/2*(28)
=9* 14=126
Answer:
126
Step-by-step explanation:
the formula for sum of arithmatic progression=n/2(2a+(n-1)d)
=9/2 (4+8*3)
=9/2*(28)
=9* 14=126
