“∑n2 = n(n+1)(2n+1)/6” has been added to your cart. Continue shopping Product Price Quantity Subtotal Spike Abacus - 5 Digits ₹520.00 Spike Abacus - 5 Digits quantity ₹520.00 ∑n2 = n(n+1)(2n+1)/6 ₹420.00 ∑n2 = n(n+1)(2n+1)/6 quantity ₹420.00 Coupon: Cart Totals Subtotal ₹940.00 9% CGST ₹84.60 9% SGST ₹84.60 Total ₹1,109.00 Continue Shopping Checkout